Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b257bc051f06607beb3004d9a1c297085e728bec
Commit:     b257bc051f06607beb3004d9a1c297085e728bec
Parent:     1174cf730179d8f029b9e93cb9a4d5bfb08d1202
Author:     Andrew Johnson <[EMAIL PROTECTED]>
AuthorDate: Fri Mar 16 13:38:24 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Mar 16 19:25:05 2007 -0700

    [PATCH] swsusp: fix suspend when console is in VT_AUTO+KD_GRAPHICS mode
    
    When the console is in VT_AUTO+KD_GRAPHICS mode, switching to the
    SUSPEND_CONSOLE fails, resulting in vt_waitactive() waiting indefinitely or
    until the task is interrupted.  This patch tests if a console switch can
    occur in set_console() and returns early if a console switch is not
    possible.
    
    [EMAIL PROTECTED]: cleanup]
    Signed-off-by: Andrew Johnson <[EMAIL PROTECTED]>
    Acked-by: Pavel Machek <[EMAIL PROTECTED]>
    Cc: "Antonino A. Daplas" <[EMAIL PROTECTED]>
    Cc: "Rafael J. Wysocki" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/char/vt.c        |   20 +++++++++++++++++++-
 drivers/char/vt_ioctl.c  |    2 +-
 include/linux/kbd_kern.h |    2 +-
 include/linux/vt_kern.h  |    1 +
 kernel/power/console.c   |   10 +++++++++-
 5 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index c3f8e38..0fefe2a 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2185,10 +2185,28 @@ static void console_callback(struct work_struct 
*ignored)
        release_console_sem();
 }
 
-void set_console(int nr)
+int set_console(int nr)
 {
+       struct vc_data *vc = vc_cons[fg_console].d;
+
+       if (!vc_cons_allocated(nr) || vt_dont_switch ||
+               (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+               /*
+                * Console switch will fail in console_callback() or
+                * change_console() so there is no point scheduling
+                * the callback
+                *
+                * Existing set_console() users don't check the return
+                * value so this shouldn't break anything
+                */
+               return -EINVAL;
+       }
+
        want_console = nr;
        schedule_console_callback();
+
+       return 0;
 }
 
 struct tty_driver *console_driver;
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index 3a5d301..1fa2da8 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -34,7 +34,7 @@
 #include <linux/kbd_diacr.h>
 #include <linux/selection.h>
 
-static char vt_dont_switch;
+char vt_dont_switch;
 extern struct tty_driver *console_driver;
 
 #define VT_IS_IN_USE(i)        (console_driver->ttys[i] && 
console_driver->ttys[i]->count)
diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index 06c58c4..506ad20 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -75,7 +75,7 @@ extern int do_poke_blanked_console;
 
 extern void (*kbd_ledfunc)(unsigned int led);
 
-extern void set_console(int nr);
+extern int set_console(int nr);
 extern void schedule_console_callback(void);
 
 static inline void set_leds(void)
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 37a1a41..e0db669 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -83,6 +83,7 @@ void reset_vc(struct vc_data *vc);
 #define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
 extern char con_buf[CON_BUF_SIZE];
 extern struct semaphore con_buf_sem;
+extern char vt_dont_switch;
 
 struct vt_spawn_console {
        spinlock_t lock;
diff --git a/kernel/power/console.c b/kernel/power/console.c
index 623786d..89bcf49 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -27,7 +27,15 @@ int pm_prepare_console(void)
                return 1;
        }
 
-       set_console(SUSPEND_CONSOLE);
+       if (set_console(SUSPEND_CONSOLE)) {
+               /*
+                * We're unable to switch to the SUSPEND_CONSOLE.
+                * Let the calling function know so it can decide
+                * what to do.
+                */
+               release_console_sem();
+               return 1;
+       }
        release_console_sem();
 
        if (vt_waitactive(SUSPEND_CONSOLE)) {
-
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